Self-sensing ultra-high performance concrete for in-situ monitoring

Qiu, Liangsheng; Dong, Sufen; Yu, Xun; Han, Baoguo

doi:10.1016/j.sna.2021.113049

Cited by 45 publications

(16 citation statements)

References 39 publications

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“…Carbon nanotube (CNT) has emerged as a fast-growing and in-demand conductive nano-material due to its excellent mechanical and electrical properties. Incorporation of CNT into conventional cement-based composites enhances their mechanical and electrical properties which opens up a broad range of possible applications as smart cementitious composite or smart cementitious composite-based sensors (SCS; Dong et al, 2020; Luo et al, 2018; Qiu et al, 2021). In order to develop the efficient smart cementitious composites, majority of the studies have focused to experimentally investigate the change in resistance/resistivity with the change in repeat compressive loading (Castañeda-Saldarriaga et al, 2021; Han et al, 2015; Sanati et al, 2018; Ubertini et al, 2014a; Wen and Chung, 2001a).…”

Section: Introductionmentioning

confidence: 99%

Real-time monitoring of structures under extreme loading using smart composite-based embeddable sensors

Rao

Sindu

Sasmal

2022

Journal of Intelligent Material Systems and Structures

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Cementitious composites reinforced with conductive nanoparticles, also known as smart composite-based sensors, are emerging as novel sensors for real-time monitoring of structures. The present study deals with the development of embeddable smart composite-based sensor (called as eSCS), for monitoring the damage evolution in large-scale beam-column (B-C) sub-assemblages. Firstly, a systematic approach has been developed to fabricate the sensors through incorporation of functionalized (-COOH) multi-walled carbon nanotubes (MWCNTs). The optimum dosage of CNTs required for developing sensors with maximum conductivity and piezo-resistivity was ascertained by determining the percolation threshold limit. The best performing eSCS was then successfully embedded at the critical locations of full-scale B-C joint specimens. The embedded sensors are used, for the first time, for damage monitoring of the B-C sub-assemblages subjected to reverse cyclic loadings. From the study, it is found that eSCS with 0.50 wt.% COOH-MWCNT shows excellent piezoresistive behaviour and gauge factors are found to be approximately 730, 457 and 396 for the applied compressive stress ranges of 2–4, 2–6 and 2–8 MPa, respectively. The embedded sensors showed the excellent strain sensing capability under reverse cyclic loading. The present study demonstrates the suitability of embedded eSCS sensors for robust structural health monitoring applications.

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Section: Introductionmentioning

confidence: 99%

Real-time monitoring of structures under extreme loading using smart composite-based embeddable sensors

Rao

Sindu

Sasmal

2022

Journal of Intelligent Material Systems and Structures

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“…range of water-cement ratio on SSUHPC is from 0.2 to 0.4 [11,29,38,40,41,44,[47][48][49][50][51][52][53][54][55].…”

Section: Matrix Materialsmentioning

confidence: 99%

“…Various types of SFs, which have different shapes (twisted SFs, hooked SFs, smooth SFs), lengths and diameters have been used [11,38,52,56]. Several investigations have reported that different types of SFs have distinct effects on the [40,49,50,52,54]. Moreover, some SFs are coated with a metal layer on their surface to enhance their conductivity, such as brass-coated straight SFs (BCSFs) [54] and copper coated SFs (CCSFs) [50].…”

Section: Functional Fillermentioning

confidence: 99%

“…Several investigations have reported that different types of SFs have distinct effects on the [40,49,50,52,54]. Moreover, some SFs are coated with a metal layer on their surface to enhance their conductivity, such as brass-coated straight SFs (BCSFs) [54] and copper coated SFs (CCSFs) [50]. CNTs and graphene are nanoscale functional fillers, having excellent conductivity but poor dispersion [46,51].…”

Section: Functional Fillermentioning

confidence: 99%

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Self-sensing ultra-high performance concrete: a review

Guo,

Wang,

Ashour

et al. 2023

Meas. Sci. Technol.

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Ultra-high performance concrete (UHPC) is an innovative cementitious composite, that has been widely applied in numerous structural projects because of its superior mechanical properties and durability. However, ensuring the safety of UHPC structures necessitates an urgent need for technology to continuously monitor and evaluate their condition during their extended periods of service. Self-sensing ultra-high performance concrete (SSUHPC) extends the functionality of UHPC system by integrating conductive fillers into the UHPC matrix, allowing it to address above demands with great potential and superiority. By measuring and analyzing the relationship between fraction change in resistivity (FCR) and external stimulates (force, stress, strain), SSUHPC can effectively monitor the crack initiation and propagation as well as damage events in UHPC structures, thus offering a promising pathway for structural health monitoring (SHM). Research on SSUHPC has attracted substantial interests from both academic and engineering practitioners in recent years, this paper aims to provide a comprehensive review on the state of the art of SSUHPC. It offers a detailed overview of material composition, mechanical properties and self-sensing capabilities, and the underlying mechanisms involved of SSUHPC with various functional fillers. Furthermore, based on the recent advancements in SSUHPC technology, the paper concludes that SSUHPC has superior self-sensing performance under tensile load but poor self-sensing performance under compressive load. The mechanical and self-sensing properties of UHPC are substantially dependent on the type and dosage of functional fillers. In addition, the practical engineering SHM application of SSUHPC, particularly in the context of large-scale structure, is met with certain challenges, such as environment effects on the response of SSUHPC. Therefore, it still requires further extensive investigation and empirical validation to bridge the gap between laboratory research and real engineering application of SSUHPC.

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“…Ultra-high-performance concrete (UHPC) is regarded as the most promising engineering material in the 21st century due to its ultra high strength, high toughness, and high durability [ 1 , 2 , 3 ]. The design principle of UHPC is to enhance the particle packing density as much as possible, so a large amount of quartz sand and cement (approximately 80% of the total weight of UHPC) are used [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Shale Powder on the Performance of Lightweight Ultra-High-Performance Concrete

Guo

Ding

2022

Materials

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In this study, lightweight ultra-high-performance concrete (L-UHPC) was prepared by using SP to replace part of the cement. The main study investigated the effect of the amount of SP on the spread diameter, apparent density and mechanical properties of L-UHPC. The mechanism of the effect of SP on the hydration product of L-UHPC was studied and the pore structure of L-UHPC was also analyzed. The results show that the incorporation of SP can effectively improve the spread diameter and reduce the apparent density of L-UHPC to a certain extent. With the increase in SP content, the compressive strength of L-UHPC at 7 days of age did not change significantly. However, the compressive strengths at 3 and 28 days of age changed significantly. When the amount of SP was less than 12%, there was no significant decrease flexural and compressive strength at 28 days of age. However, the flexural and compressive strength of L-UHPC gradually decreased when the amount of SP was greater than 12%. The microstructure shows that SP can reduce the content of portlandite. This is mainly due to the fact that the addition of SP improved the stacking compactness of L-UHPC and promoted secondary hydration reactions. The content of portlandite and the hydration degree of cement were reduced. At the same time, the exothermic hydration of L-UHPC with SP was less, the hydration process was slow, and the exothermic rate of initial hydration was low. An appropriate amount of SP can effectively improve the pore structure of L-UHPC and significantly reduce the pore volume of harmful pores (50~200 nm). SP can make the L-UHPC structure more compact and has a positive effect on the development of L-UHPC strength.

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Self-sensing ultra-high performance concrete for in-situ monitoring

Cited by 45 publications

References 39 publications

Real-time monitoring of structures under extreme loading using smart composite-based embeddable sensors

Real-time monitoring of structures under extreme loading using smart composite-based embeddable sensors

Self-sensing ultra-high performance concrete: a review

Effect of Shale Powder on the Performance of Lightweight Ultra-High-Performance Concrete

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